fix: error handling and grace shutdown during udf failures

[yhl25]

No description provided.

[codecov]

Codecov Report

Attention: Patch coverage is 82.80840% with 131 lines in your changes missing coverage. Please review.

Project coverage is 71.14%. Comparing base (01cc33d) to head (683bd8b).
Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
rust/numaflow-core/src/mapper/map.rs	83.70%	37 Missing ⚠️
...numaflow-core/src/pipeline/isb/jetstream/reader.rs	85.84%	15 Missing ⚠️
rust/numaflow-core/src/source.rs	75.80%	15 Missing ⚠️
...aflow-core/src/pipeline/forwarder/map_forwarder.rs	62.06%	11 Missing ⚠️
rust/numaflow-core/src/monovertex/forwarder.rs	67.85%	9 Missing ⚠️
...flow-core/src/pipeline/forwarder/sink_forwarder.rs	59.09%	9 Missing ⚠️
...ow-core/src/pipeline/forwarder/source_forwarder.rs	68.96%	9 Missing ⚠️
...numaflow-core/src/pipeline/isb/jetstream/writer.rs	84.09%	7 Missing ⚠️
rust/numaflow-core/src/lib.rs	0.00%	6 Missing ⚠️
rust/numaflow-core/src/sink.rs	86.84%	5 Missing ⚠️
... and 4 more

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2406      +/-   ##
==========================================
+ Coverage   71.08%   71.14%   +0.06%     
==========================================
  Files         368      368              
  Lines       53321    53558     +237     
==========================================
+ Hits        37903    38106     +203     
- Misses      14346    14373      +27     
- Partials     1072     1079       +7     

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